Ukrainian forces and Russia-backed separatists rocketed each other with heavy artillery fire Saturday — shelling that extended far beyond any front lines — as the hours ticked down to a cease-fire that was supposed to start at midnight.

Gunmen fired on a cafe in Copenhagen as it hosted a free speech event Saturday, killing one man in a likely terror attack, Danish authorities said. The event was organized by Swedish artist Lars Vilks, who has faced numerous threats after...